must oppugn
Regular verb: oppugn - oppugned- oppugned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must oppugn
you must oppugn
he must oppugn
we must oppugn
you must oppugn
they must oppugn 	I must be oppugning
you must be oppugning
he must be oppugning
we must be oppugning
you must be oppugning
they must be oppugning	I must have oppugned
you must have oppugned
he must have oppugned
we must have oppugned
you must have oppugned
they must have oppugned	I must have been oppugning
you must have been oppugning
he must have been oppugning
we must have been oppugning
you must have been oppugning
they must have been oppugning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not oppugn
you must not oppugn
he must not oppugn
we must not oppugn
you must not oppugn
they must not oppugn 	I must not be oppugning
you must not be oppugning
he must not be oppugning
we must not be oppugning
you must not be oppugning
they must not be oppugning	I must not have oppugned
you must not have oppugned
he must not have oppugned
we must not have oppugned
you must not have oppugned
they must not have oppugned	I must not have been oppugning
you must not have been oppugning
he must not have been oppugning
we must not have been oppugning
you must not have been oppugning
they must not have been oppugning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I oppugn?
must you oppugn?
must he oppugn?
must we oppugn?
must you oppugn?
must they oppugn? 	must I be oppugning?
must you be oppugning?
must he be oppugning?
must we be oppugning?
must you be oppugning?
must they be oppugning? 	must I have oppugned?
must you have oppugned?
must he have oppugned?
must we have oppugned?
must you have oppugned?
must they have oppugned? 	must I have been oppugning?
must you have been oppugning?
must he have been oppugning?
must we have been oppugning?
must you have been oppugning?
must they have been oppugning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not oppugn?
must you not oppugn?
must he not oppugn?
must we not oppugn?
must you not oppugn?
must they not oppugn? 	must I not be oppugning?
must you not be oppugning?
must he not be oppugning?
must we not be oppugning?
must you not be oppugning?
must they not be oppugning? 	must I not have oppugned?
must you not have oppugned?
must he not have oppugned?
must we not have oppugned?
must you not have oppugned?
must they not have oppugned? 	must I not have been oppugning?
must you not have been oppugning?
must he not have been oppugning?
must we not have been oppugning?
must you not have been oppugning?
must they not have been oppugning?